Keystones — Capstone
Five GCSE retrieval questions · 25 November 2010 · mathsvault.uk/keystones
-
1. Number Simplifying surds
Simplify: √504
Answer: 6√14 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 2
Answer: 2(x + 5)² - 52 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 49°. Give your answer to 2 decimal places
Answer: 81.51cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 97, 35, 45, 68, 72, 97, 18, 37. Give your answer to 2 decimal places
Answer: Mean = 58.11, Median = 54, Range = 79